Created attachment 316408 [details]
testcase

Created attachment 316409 [details]
updated testcase

Since this started as a report that the check for bug 185240 fails in a strange way on ppc, here is a hack that fills the gap in sys/ioctl.ph

# redefine broken _IOC_TYPECHECK macro
sub _IOC_TYPECHECK {
  $sizeof{$_[0]} or do {
    # can't die because we're being eval-ed by _IOR or _IOW
    print STDERR "invalid size argument for IOC: \%sizeof contains no '$_[0]' ke
    exit 1;
  }
}

# define a sizeof hash
%sizeof = (
        int => 4, 'unsigned int' => 4, 'struct winsize' => 8,
)

I forgot to give proper credit; the workaroud presented in comment #6 comes from a comment by Kevin Buhr:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=190887#15